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Income Taxes (Details 2) - USD ($)
$ in Thousands
Dec. 29, 2017
Dec. 30, 2016
Deferred tax assets:    
Allowance for doubtful accounts and sales returns $ 230 $ 244
Inventories 381 662
Accrued vacation 322 437
Accrued other expenses 559 596
Stock-based compensation 1,444 2,154
Pensions 720 625
Depreciation and amortization 959 1,060
Net operating loss carryforwards 33,770 53,232
Business, foreign, AMT and R and D credit carryforwards 3,706 1,665
Prepaid Expenses 188 0
Capitalized R&D 941 920
Other 92 94
Valuation allowance (40,656) (57,446)
Total deferred tax assets 2,656 4,243
Deferred tax liabilities:    
Foreign tax withholding (881) (881)
Amortization of R&D (723) (670)
Net Foreign earnings not permanently reinvested (160) (2,468)
Total deferred tax liabilities (1,764) (4,019)
Total net non-current deferred tax assets $ 892 $ 224